Of five letters (a, b, c, d, and e), two letters are to be selected at random without replacement. how many possible selections are there

What is the volume of this square pyramid?

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

Abcd ≅ klmn ≅ pqrs ≅ wxyz given that information, which figures are reflections of abcd?